Dirty story:

First, there was solid rock. Then, the continued heating from the sun and cooling at night broke off a large chunk of the rock. Then there was an earthquake, and the chunk of rock rolled into a stream. The action of the stream bashed the chunk into other rocks, grdually breaking the rock into smaller & smaller pieces. The waters receded, leaving the pebbles exposed to the wind. At time, the wind blew strongly, picking up the pebbles and depositing them over other areas , and wearing them down into miniscule pieces. Sometimes, the pebbles were again submerged, becomming coaated with dead and decalying plant and animal matter. At other times, the pebbles were again exposed to the air, where the winds intermixed the pebbles & decayed organic material, often again wearing the pebbles into smaller & smaller pieces.

And that's how you get dirt.

__________________
On the kinkometer, my kink measures as a sine wave.